SU847901A3 - Method of cold pressure treatment - Google Patents

Abstract

To prevent galling during the drawing and ironing process, black plate is provided with an economical coating for improving surface lubricity. Cold-reduced strip is rinsed with a solution containing soluble salts of manganese and sulfur, e.g. MnSO4; the strip is dried and then heated to above 800 DEG F in a reducing atmosphere, such as HNX. Heating is conducted at a temperature sufficient to reduce the sulfates and provide a surface coating of MnS in which the surface sulfur concentration is in excess of 0.5%.

Description

turns out to be less costly than in the course of a dragging operation,.

Thus, any system in which there is a tendency to jam during the course of the test. Type of treatment with solution, M

Without processing Processing

manganese sulphate O, 1 manganese sulphate O, 2 aluminum sulphate 0.1 aluminum sulphate O, 2 zinc sulphate 0.2 copper sulphate O, 2 lithium formate O, 1 magnesium formate 0.1 sulphate 0.1 tin sulphate 0.2 iron sulfate OD nickel sulfate OD sulfate cobalt O, 1 aluminum molybdate 0.2 sulfate O, 1 aluminum formate 0.1 lead acetate O, 2

friction may in all cases be rated as unsatisfactory for practical stretching and dragging operations. The test results of friction are presented in table. one.

Table 1

Jamming (tearing) tool

yv

Strong

Traces Absence Easy Absence Same

Medium Same

Weak:., G.

yv

e Force 1 .. dmee Light Strong Same

All solutions of metal sulfate and molybdate aluminium, which are listed in this table, also contain a 67i M solution of sulfuric acid I. The reducing force in all trials is 2668 kg / m.

From the evaluation of the data we can conclude that the untreated samples during processing are strongly stuck and destroyed during the test. However, the treatment with some solutions allows existing things,, ;;. And: - .. friction and prevent sticking.

 Te p,.;:; GBGpy for flushing, which reduces the drag force up to levels of 240 kg, direct further laboratories to laboratory tests.

a press, of which some cans are made from

Estimation of h & d when processing Hc laboratory nt; ecc; e. Tsana-in table. 2

Processing type

0.2 M solution of zinc sulfate 0.1 M solution of sulfuric acid

0.2 M copper sulphate solution, 0.1 M sulfuric acid solution

Magnesium solution, concentration 3 g / l

0.2 M ammonium sulfate solution; 1 M sulfuric acid solution

0 / 2M solution of manganese sulfate

0.1 M solution of sulfuric acid

In addition to significantly reducing the tendency to bind, manganese sulphate treatment reduces the forces applied during processing.

When comparing samples treated with a solution of manganese sulphate, it was found that samples with higher characteristics contain a more superficial concentration of sulfur. In addition, the difference in sulfur concentrations is primarily due to the nature of the atmosphere in which the annealing is performed (Table 3), In this case

As can be seen from the results of Table 3, an atmosphere whose dew point significantly exceeds -32 ° C makes it possible to provide only a slight surface enrichment with sulfur. Atmosphere with a dew point of at least -32C allowed Table 2 Jamming

Jamming on the 4th product

Scratches on the 6th item

Jamming on the 2nd item

Destruction of the 1st product

The test was completed after making 24 samples.

The requirements are: the atmosphere in which the annealing takes place must

be non-oxidative in regards to ga-; Because the formation of surface oxides affects the reduction of manganese sulphate to: manganese sulphate; the dew point of this

atmosphere should be able to significantly reduce the degree of surface enrichment of sulfur.

The effect of the dew point of the atmosphere in which the annealing occurs (95% nitrogen

and 5% of hydrogen) on the surface composition are presented in table 3.

Table 3

It does not produce relatively high sulfur concentrations in the surface layer.

Thus, any roughing of low carbon steels can be treated by coating in accordance with the method given in order to ensure the effectiveness of the lubricant before carrying out the most varied molding operations,

Claims (3)

1. A method of cold working by pressing a low-carbon steel billet by applying a lubricant before cold working, at least one of which components is applied in the back of the coating, for which a water solution of manganese sulfate is sprayed onto the cleaned surface to form a water film and then heating the workpiece in a reducing atmosphere with drying the coating, characterized in that, in order to increase the effectiveness of the lubricant, a 0.05-2.0 M solution of manganese sulphate is used, stopping the formation of water lenoks with manganese content 104-520 mg / m, and the heating is carried out to a temperature of 427 before combining it with the annealing of the preform. 2. Method POP1, characterized in that, in order to further increase the efficiency of the process, a 0.1-0.5 M solution of manganese sulphate is used, spraying a water film until the content of manganese in the coating reaches 161-377 mg / m, wherein the heating is conducted to a temperature of from 538 to 816 ° C. 3. Method according to paragraphs. 1 and 2, characterized in that the dew point of the reducing atmosphere is 5 less - 320 ° С with a surface sulfur concentration of 1-2%. Sources of information taken into account in the examination 0 1- US Patent No. З 07408, cl. 148-12.1, 1972.